from flask import render_template, current_app, session, request, jsonify

from info import redis_store, constants
from info.models import User, News, Category
from info.utils.response_code import RET

from . import  index_blu

@index_blu.route('/news_list')
def news_list():
    """
    获取首页新闻数据
    :return:
    """

    # 1.获取参数
    cid = request.args.get("cid","1")
    page = request.args.get("page", "1")
    per_page = request.args.get("per_page", "10")

    # 2.校验参数
    try:
        cid = int(cid)
        page = int(page)
        per_page = int(per_page)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno = RET.PARAMERR,errmsg = "参数")

    filters = []
    if cid != 1:
        # 需要添加条件
        filters.append(News.category_id == cid)

    # 3.查询数据
    try:
        paginate = News.query.filter(*filters).order_by(News.create_time.desc()).paginate(page,per_page,False)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno = RET.DBERR,errmsg = "数据查询错误")

    # 取到当前页面的数据
    news_model_list = paginate.items
    total_page = paginate.pages
    current_page = paginate.pages

    # 将模型对象列表转成字典列表
    news_dict_li = []
    for news in news_model_list:
        news_dict_li.append(news.to_basic_dict())


    data = {
        "total_page":total_page,
        "current_page":current_page,
        "news_dict_li":news_dict_li
    }
    return jsonify(errno=RET.OK,errmsg ="OK",data=data)




@index_blu.route('/')
def index():
    """
    显示首页
    如果用户已登录，将当前登录用户的数据传到模板中，供模板显示

    :return:
    """
    # session['name'] = "itheima"
    # redis_store.set('name','itheima')

    # 取到用户id
    user_id = session.get("user_id",None)
    user = None
    if user_id:
        # 查询用户模型
        try:
            user = User.query.get(user_id)
        except Exception as e:
            current_app.logger.error(e)

    # 右侧新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 定义一个空的字典列表，里面装的字典
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询分类数据，通过模板的形式渲染出来
    categories = Category.query.all()

    category_li = []
    for category in categories:
        category_li.append(category.to_dict())

    data = {
        "user":user.to_dict() if user else None,
        "news_dict_li":news_dict_li,
        "category_li":category_li
    }
    return render_template("news/index.html",data = data)

# send_static_file 是 flask 去查找指定的静态文件所调用的方法
# 网站标签小图标
@index_blu.route('/favicon.ico')
def favicon():
    return current_app.send_static_file('news/favicon.ico')





